Equipment Connections: RTU, AHU, VAV, Fans & Louvers

261 records, red lane first.

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A clogged bird screen makes the intake louver collapse inward
Field problem · 4th Year
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Actuator and Wiring Scope at Dampers
Field problem · 4th Year
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Actuator and Wiring Scope at Dampers
Foreman script · 1st Year
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An RTU curb gasket is torn, skipped, or leaking at a corner
Field problem · 4th Year
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An exterior louver is installed upside down and catches rain
Field problem · 4th Year
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An exterior louver is installed upside down or backwards
Field problem · 4th Year
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Ductwork Insulation at Fire Damper
Field problem · 4th Year
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Ductwork in Data Centers
Foreman script · 3rd Year
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Ductwork in Healthcare Facilities
Field problem · 4th Year
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First healthcare infection-control work area
Foreman script · 3rd Year
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How can a clogged louver bird screen collapse an intake louver?
Apprentice question · 4th Year
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How can you tell if an exterior intake louver is installed the wrong way?
Apprentice question · 2nd Year
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How do I calculate the center of gravity for an asymmetrical Make-Up Air Unit (MAU)?
Apprentice question · 4th Year
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How do I determine the load capacity of my synthetic rigging straps based on the angle?
Apprentice question · 4th Year
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How do I install a flexible connection (canvas connector) at the equipment discharge?
Apprentice question · 2nd Year
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How do I safely rig and hoist ductwork up the outside of a building using a material hoist?
Apprentice question · 4th Year
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How do I set a split-system air handler in a tight mechanical room using machine skates?
Apprentice question · 4th Year
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How do I verify the RTU curb gasket is seated perfectly before the crane unhooks?
Apprentice question · 4th Year
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Lowering Duct Into a Shaft Without Controlling Rotation
Foreman script · 2nd Year
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Not establishing a proper rigging plan reviewed by a foreman before setting a large RTU
Common mistake · 4th Year
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RTU Curb Height and Rail Alignment
Field problem · 4th Year
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RTU Curb Height and Rail Alignment
Foreman script · 2nd Year
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RTU curb check before equipment set
Foreman script · 4th Year
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Roof Curb Flashing
Field problem · 4th Year
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Roof Curb Flashing
Foreman script · 2nd Year
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Roof Curb to RTU Duct Connection
Foreman script · 2nd Year
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Roof Support for Duct on Roof
Field problem · 4th Year
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Roof Support for Duct on Roof
Foreman script · 2nd Year
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Rooftop curb counter-flashing is letting rain under the unit
Field problem · 4th Year
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Siding or plywood blocks the back of a fresh-air intake louver
Field problem · 4th Year
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Structural bracing blocks a VAV access panel
Field problem · 4th Year
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TAB asks me to reset or open a tripped fire/smoke damper
Field problem · 4th Year
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Using rigging equipment that has not been inspected within the required time period
Common mistake · 4th Year
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Verify Roof Curb and RTU Match Before the Lift
Field problem · 4th Year
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Verify Roof Curb and RTU Match Before the Lift
Foreman script · 1st Year
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Water Enters Rooftop Duct or a Louver Plenum
Field problem · 4th Year
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What are the standard hand signals for communicating with a crane operator?
Apprentice question · 4th Year
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What do I check when equipment, duct, or supports are exposed to pool chemicals or chloramines?
Field problem · 4th Year
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What do I check when landing equipment on a curb?
Field problem · 4th Year
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What do I do if a VAV hot-water coil fitting gets twisted and starts leaking?
Field problem · 4th Year
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What do I do if an RTU curb gasket is torn or missing at a corner?
Apprentice question · 3rd Year
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What happens if an outside-air intake louver is covered from behind?
Apprentice question · 2nd Year
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What is a spreader bar, and when must I use one to lift an RTU?
Apprentice question · 4th Year
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What is the minimum clearance needed for the VAV control panel access?
Apprentice question · 2nd Year
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What is the procedure for safely offloading semi-trucks on a busy city street?
Apprentice question · 4th Year
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What is the proper way to set a curb adapter when replacing an old RTU?
Apprentice question · 3rd Year
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What's the best way to support a heavy fan coil unit above a drop ceiling?
Apprentice question · 2nd Year
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What's the difference between a choker hitch and a basket hitch when slinging an RTU?
Apprentice question · 4th Year
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What's the procedure for installing a gooseneck (hood) for an outside air intake?
Apprentice question · 3rd Year
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What's the protocol for crane lifts if the wind speed exceeds 20 mph?
Apprentice question · 4th Year
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Why can blocking the back of a fresh-air intake louver starve the system?
Apprentice question · 2nd Year
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Why do wrong fasteners corrode aluminum louver frames?
Apprentice question · 3rd Year
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Why does a large exterior louver bank need a sill pan flashing?
Apprentice question · 3rd Year
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Why is an upside-down exterior louver such a big problem?
Apprentice question · 2nd Year
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Why is reverse-lapped louver flashing a serious water problem?
Apprentice question · 3rd Year
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Why is water getting under a rooftop curb counter-flashing?
Apprentice question · 3rd Year
Check first
A 45-degree branch enters directly into a VAV inlet and causes bad readings
Field problem · 2nd Year
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A VAV discharge is necked down right after the box
Field problem · 2nd Year
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A backdraft damper at a louver is installed backward
Field problem · 2nd Year
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A blast gate clamps spiral pipe out of round
Field problem · 2nd Year
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A canvas/flexible connector tears on startup
Field problem · 2nd Year
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A damper actuator hums but the blades do not move
Field problem · 2nd Year
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A fan canvas connector balloons or tears on startup
Field problem · 2nd Year
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A fan coil condensate trap is dry or air-locked and the pan overflows
Field problem · 2nd Year
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A multi-section louver leaks at the vertical mullion joint
Field problem · 2nd Year
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A return plenum wall buckles inward at AHU startup
Field problem · 2nd Year
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A rooftop curb is flat but the roof deck is sloped
Field problem · 2nd Year
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A sound attenuator is installed backwards
Field problem · 2nd Year
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A temporary louver blank-off blows out on startup
Field problem · 2nd Year
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AHU access doors blocked by duct/hangers
Field problem · 2nd Year
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Allowing apprentices to use equipment without verifying they have been trained and authorized
Common mistake · 2nd Year
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An AHU condensate trap is too shallow and the pan overflows
Field problem · 2nd Year
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An automated louver actuator hums but the blades do not move
Field problem · 2nd Year
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An elbow is installed directly on a VAV inlet
Field problem · 2nd Year
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An internal VAV damper blade drops shut and blocks airflow
Field problem · 2nd Year
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Backdraft damper/access not considered at fan
Field problem · 2nd Year
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Bird Screen on Outside Air Intakes
Foreman script · 1st Year
Check first
Can you confirm this curb/opening matches the unit before we connect duct
Foreman script · 3rd Year
Check first
Can you confirm this curb/opening matches the unit before we connect duct
Foreman script · 3rd Year
Check first
Can you confirm this curb/opening matches the unit before we connect duct
Foreman script · 3rd Year
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Can you confirm this curb/opening matches the unit before we connect duct
Foreman script · 3rd Year
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Can you confirm this curb/opening matches the unit before we connect duct
Foreman script · 3rd Year
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Coil pull space blocked by duct run
Field problem · 2nd Year
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Condensate/drain clearance around equipment not checked
Field problem · 2nd Year
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Confusing a VAV box with a fan coil unit on drawings
Common mistake · 2nd Year
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Designing a duct path that creates excessive system effect at the fan discharge
Common mistake · 2nd Year
Check first
Do I need to internally line the first 10 feet of duct leaving the VAV box?
Apprentice question · 2nd Year
Check first
Do duct silencers and sound attenuators have airflow direction?
Apprentice question · 2nd Year
Check first
Do you want this vav connection adjusted for access or support before final
Foreman script · 3rd Year
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Do you want this vav connection adjusted for access or support before final
Foreman script · 3rd Year
Check first
Do you want this vav connection adjusted for access or support before final
Foreman script · 3rd Year
Check first
Do you want this vav connection adjusted for access or support before final
Foreman script · 3rd Year
Check first
Do you want this vav connection adjusted for access or support before final
Foreman script · 3rd Year
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Do you want this vav connection adjusted for access or support before final
Foreman script · 3rd Year
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Does this connection leave enough service access
Foreman script · 3rd Year
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Does this connection leave enough service access
Foreman script · 3rd Year
Check first
Does this connection leave enough service access
Foreman script · 3rd Year
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Does this connection leave enough service access
Foreman script · 3rd Year
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Does this fan connection need isolation or support corrected before final
Foreman script · 3rd Year
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Does this fan connection need isolation or support corrected before final
Foreman script · 3rd Year
Check first
Does this fan connection need isolation or support corrected before final
Foreman script · 3rd Year
Check first
Does this fan connection need isolation or support corrected before final
Foreman script · 3rd Year
Check first
Does this fan connection need isolation or support corrected before final
Foreman script · 3rd Year
Check first
Does this fan connection need isolation or support corrected before final
Foreman script · 3rd Year
Check first
Does this fan connection need isolation or support corrected before final
Foreman script · 3rd Year
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Downstream VAV Layout: Protect Diffuser Performance and Access
Field problem · 2nd Year
Check first
Downstream VAV Layout: Protect Diffuser Performance and Access
Foreman script · 1st Year
Check first
Duct blocks electrical/control panel clearance
Field problem · 2nd Year
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Duct connection to RTU curb does not line up
Field problem · 2nd Year
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Duct is sweating or condensation is showing after startup. What do I check?
Field problem · 2nd Year
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Duct leakage at equipment collar
Field problem · 2nd Year
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Ductwork Sound Attenuation Requirements
Field problem · 2nd Year
Check first
Ductwork in Assembly and Convention Spaces
Field problem · 2nd Year
Check first
Ductwork in Data Centers
Field problem · 2nd Year
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Ductwork in Gyms and Fitness Centers
Field problem · 2nd Year
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Ductwork in Hotels and Hospitality
Field problem · 2nd Year
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Ductwork in Loading Docks
Field problem · 2nd Year
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Ductwork in Loading Docks
Foreman script · 2nd Year
Check first
Ductwork in Telecommunications Rooms
Field problem · 2nd Year
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Ductwork in Theaters and Performance Spaces
Field problem · 2nd Year
Check first
Economizer and Outside-Air Hood Field Check
Field problem · 2nd Year
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Economizer and Outside-Air Hood Field Check
Foreman script · 1st Year
Check first
Equipment cabinet fastening point
Foreman script · 3rd Year
Check first
Equipment vibration isolation ignored
Field problem · 2nd Year
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Exterior Duct Coating Is Damaged by Slings or Handling
Field problem · 2nd Year
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Exterior Duct Expansion Joint Is Installed at the Wrong Location
Field problem · 2nd Year
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Exterior Duct Joint or Support Creates a Water-Catching Low Spot
Field problem · 2nd Year
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Exterior Insulation Jacket Is Punctured at a Support
Field problem · 2nd Year
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Fan rotation/access/startup needs ignored
Field problem · 2nd Year
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Filter access blocked by duct or hangers
Field problem · 2nd Year
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Fireproofing or Paint Overspray Lands on Exposed Retail Duct
Foreman script · 2nd Year
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Flex connector installed twisted or stretched wrong
Field problem · 2nd Year
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Flexible Connector at Equipment: Enough Slack, No Collapse
Field problem · 2nd Year
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Flexible Connector at Equipment: Enough Slack, No Collapse
Foreman script · 1st Year
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Gooseneck Orientation for Weather
Field problem · 2nd Year
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Gooseneck Orientation for Weather
Foreman script · 2nd Year
Check first
Hanger/brace transferring stress into equipment
Field problem · 2nd Year
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How can long screws lock a louver blade track shut?
Apprentice question · 2nd Year
Check first
How do I coordinate with the roofer before cutting the roof deck for a new curb?
Apprentice question · 3rd Year
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How do I determine the "right" and "left" hand side of a VAV box?
Apprentice question · 2nd Year
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How do I install a pitch pocket for refrigerant lines penetrating the roof deck?
Apprentice question · 3rd Year
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How do I properly secure the reheat coil to the VAV discharge?
Apprentice question · 2nd Year
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How do I run exposed roof ductwork so it meets wind-load requirements?
Apprentice question · 3rd Year
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How do I seal the duct drop inside a roof curb so water can't get into the building?
Apprentice question · 3rd Year
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How do I square up and level a roof curb on a pitched roof?
Apprentice question · 3rd Year
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How do I transition from rectangular duct to the round inlet of a VAV?
Apprentice question · 2nd Year
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How many duct diameters of straight pipe do I need before the inlet of a VAV box?
Apprentice question · 2nd Year
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How should inactive sections of a louver be blanked off?
Apprentice question · 2nd Year
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Ignoring pinch-point hazards on mechanical equipment during installation
Common mistake · 2nd Year
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Installing a mixed air plenum without leaving access for the mixing damper actuators
Common mistake · 2nd Year
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Installing a sound attenuator (silencer) oriented backward relative to airflow
Common mistake · 2nd Year
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Installing a straight run of duct without expansion joints in a long plenum
Common mistake · 2nd Year
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Installing vibration isolators upside down on a fan that has asymmetric loading
Common mistake · 2nd Year
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Is this connection fit clean enough to seal, or should I adjust it first
Foreman script · 3rd Year
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Is this transition facing the right way before I fasten it
Foreman script · 3rd Year
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Laying out a large duct bank without establishing a baseline control point first
Common mistake · 2nd Year
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Louver Free Area vs Face Area
Foreman script · 2nd Year
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Louver expansion alignment keys were screwed solid
Field problem · 2nd Year
Check first
Louver sleeve fasteners strip out from fan vibration
Field problem · 2nd Year
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Mechanical Check Before Handing a Damper Actuator to Controls
Field problem · 2nd Year
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Mechanical Check Before Handing a Damper Actuator to Controls
Foreman script · 1st Year
Check first
Multi-section louver panels buckle because they were installed tight together
Field problem · 2nd Year
Check first
Not accounting for diversity factor when sizing a multi-zone VAV supply duct main
Common mistake · 2nd Year
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Not accounting for system effect losses at fan inlet when sizing ductwork
Common mistake · 2nd Year
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Not supporting duct near equipment connection
Field problem · 2nd Year
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Not understanding the difference between 2-pipe and 4-pipe fan coil systems
Common mistake · 2nd Year
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Not understanding the purpose of a bypass damper in a VAV system
Common mistake · 2nd Year
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Not verifying a VAV box actuator strokes fully open and closed before startup
Common mistake · 2nd Year
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Not verifying that a rooftop unit curb is level and flashed before setting the unit
Common mistake · 2nd Year
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Overlooking external static pressure when selecting a replacement fan for a retrofit
Common mistake · 2nd Year
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Overlooking the effects of duct leakage on system static pressure and fan selection
Common mistake · 2nd Year
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Protect Equipment Service Clearance Before Duct Is Final
Field problem · 2nd Year
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Protect Equipment Service Clearance Before Duct Is Final
Foreman script · 1st Year
Check first
RTU Supply and Return Transition Verification
Field problem · 2nd Year
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RTU Supply and Return Transition Verification
Foreman script · 1st Year
Check first
Roof Curb to RTU Duct Connection
Field problem · 2nd Year
Check first
Roof Pitch Leaves the Curb or Duct Connection Out of Alignment
Field problem · 2nd Year
Check first
Roof-Curb Vibration and Weather Seal: Keep Both Functions Intact
Field problem · 2nd Year
Check first
Roof-Curb Vibration and Weather Seal: Keep Both Functions Intact
Foreman script · 1st Year
Check first
Rooftop duct is holding water on top
Field problem · 2nd Year
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Room for belts/pulleys/fan maintenance not left
Field problem · 2nd Year
Check first
Should I add/support hangers before tightening this equipment connection
Foreman script · 3rd Year
Check first
Should I verify the equipment detail before connecting this duct
Foreman script · 3rd Year
Check first
Should I verify the equipment detail before connecting this duct
Foreman script · 3rd Year
Check first
Should I verify the equipment detail before connecting this duct
Foreman script · 3rd Year
Check first
Should I verify the equipment detail before connecting this duct
Foreman script · 3rd Year
Check first
Should I verify the equipment detail before connecting this duct
Foreman script · 3rd Year
Check first
Should I verify the equipment detail before connecting this duct
Foreman script · 3rd Year
Check first
Should I verify the equipment detail before connecting this duct
Foreman script · 3rd Year
Check first
Should I verify the equipment detail before connecting this duct
Foreman script · 3rd Year
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Should a VAV box be hung independently of the ductwork?
Apprentice question · 2nd Year
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Should we verify the louver seal/drainage/access detail before connecting
Foreman script · 3rd Year
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Smoke control or life-safety equipment not recognized
Field problem · 2nd Year
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Straight Duct Before a VAV Inlet
Field problem · 2nd Year
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Straight Duct Before a VAV Inlet
Foreman script · 1st Year
Check first
Submit a real field problem for TinnerFlow review
Foreman script · 2nd Year
Check first
Support a VAV Box Without Blocking Service
Field problem · 2nd Year
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Support a VAV Box Without Blocking Service
Foreman script · 1st Year
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Using a plasma table program that hasn't been proofed, wasting a full sheet
Common mistake · 2nd Year
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VAV Box Clearance Requirements
Field problem · 2nd Year
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VAV Box Inlet and Outlet Orientation
Field problem · 2nd Year
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VAV sensor tubes are pinched against structure
Field problem · 2nd Year
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Vibration Isolation at Fans and Air-Handling Equipment
Field problem · 2nd Year
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Vibration Isolation at Fans and Air-Handling Equipment
Foreman script · 1st Year
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What do I check before an RTU or big equipment gets set on a roof curb?
Field problem · 2nd Year
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What do I check before tying duct into a VAV box?
Field problem · 2nd Year
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What is a "doghouse" on a roof, and how do I flash duct penetrating the side of it?
Apprentice question · 3rd Year
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What should I check before fastening duct to an equipment cabinet?
Field problem · 2nd Year
Check first
What's the difference between a canted curb and a flat curb?
Apprentice question · 3rd Year
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Where do I place the vibration isolators on a custom curb?
Apprentice question · 3rd Year
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Where do the auxiliary drain pans go under a fan coil unit?
Apprentice question · 2nd Year
Check first
Why can an out-of-square opening jam louver blades?
Apprentice question · 2nd Year
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Why do drywall screws fail on a vibrating louver sleeve?
Apprentice question · 2nd Year
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Why do multi-section louvers need room for thermal movement?
Apprentice question · 3rd Year
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Why do sharp offsets right at a VAV inlet cause bad CFM readings?
Apprentice question · 3rd Year
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Why does a VAV box act wrong when the flow sensor tubing is kinked?
Apprentice question · 3rd Year
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Why does a bent louver actuator crank arm lock the blades?
Apprentice question · 3rd Year
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Why does a damper actuator run but the blades stay frozen?
Apprentice question · 3rd Year
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Why does a fan coil drain pan overflow if the P-trap is dry or unvented?
Apprentice question · 3rd Year
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Why does a rooftop unit need a level curb on a sloped roof?
Apprentice question · 3rd Year
Check first
Why does an uninsulated louver blank-off panel sweat in cold weather?
Apprentice question · 3rd Year
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Why does silicone on the outside not fix a leaking louver splice?
Apprentice question · 3rd Year
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Why is a 45-degree entry bad right at a VAV inlet?
Apprentice question · 3rd Year
Check first
Why is rooftop duct holding water on top?
Apprentice question · 3rd Year
Check first
Why should louver expansion keys be allowed to move?
Apprentice question · 3rd Year
Check first
Why would a VAV show zero airflow even though the actuator is running?
Apprentice question · 3rd Year
Check first
Why would a large return plenum wall oil-can or buckle inward when the air handler starts?
Apprentice question · 3rd Year
Check first
Why would rain leak through the center joint of a multi-section louver?
Apprentice question · 3rd Year
Coordinate
AHU or RTU startup found an install problem. What should I document first?
Field problem · 3rd Year
Coordinate
Connecting duct before RTU curb is verified
Field problem · 3rd Year
Coordinate
Duct transition too abrupt at fan/equipment
Field problem · 3rd Year
Coordinate
Equipment connection installed before curb/unit verified
Field problem · 3rd Year
Coordinate
Equipment tag against print not checked
Field problem · 3rd Year
Coordinate
Failing to de-energize equipment before working near it (not following lockout/tagout)
Common mistake · 3rd Year
Coordinate
Louver connection not weatherproof/coordinated
Field problem · 3rd Year
Coordinate
Mixed systems tied to wrong equipment
Field problem · 3rd Year
Coordinate
Not asking before modifying equipment connection detail
Field problem · 3rd Year
Coordinate
Not supporting duct at fan inlet/outlet
Field problem · 3rd Year
Coordinate
Signing off on controls work that has not been commissioned through a full sequence test
Common mistake · 3rd Year
Coordinate
Transition blocks AHU filter access
Field problem · 3rd Year
Coordinate
VAV box flow arrow not checked
Field problem · 3rd Year
Coordinate
VAV box installed without access clearance
Field problem · 3rd Year
Coordinate
VAV controller/actuator inaccessible after duct install
Field problem · 3rd Year
Coordinate
VAV reheat coil piping controls not coordinated
Field problem · 3rd Year
Coordinate
Wrong diffuser/boot connection at terminal unit
Field problem · 3rd Year
Coordinate
Wrong inlet/outlet orientation on VAV box
Field problem · 3rd Year
Standard
A fan coil is hard-connected and vibrating the ceiling grid
Field problem · 1st Year
Standard
Ductwork in Restaurants (Non-Grease)
Field problem · 1st Year
Standard
Ductwork in Retail Spaces
Field problem · 1st Year
Standard
Fan bracing creates a metal vibration bridge across a sound trap
Field problem · 1st Year
Standard
How do I avoid the blown-fused cordless charger circuit?
Apprentice question · 1st Year
Standard
Why can a normal transfer louver fail an architectural light-leak check?
Apprentice question · 3rd Year
Standard
Why can solid metal bracing around a sound attenuator make noise worse?
Apprentice question · 3rd Year
Standard
Why does over-tightening a ceiling filter louver frame lock the hinge door?
Apprentice question · 2nd Year
Standard
Why would hot air whistle out of the reheat coil frame on a VAV box?
Apprentice question · 2nd Year
Reference
Equipment opening / curb check
Reference · 1st Year
Reference
Measure elevation from AFF or control line
Reference · 1st Year
Reference
RTU and Curb Basics
Reference · 1st Year
Reference
Use one control point
Reference · 1st Year
Reference
VAV Box Basics
Reference · 1st Year
Reference
VAV connection measurement
Reference · 1st Year